MCP2030 Three-Channel Analog Front-End Device Overview

TB090 MCP2030 Three-Channel Analog Front-End Device Overview FIGURE 1: PIN DIAGRAM Author: Youbok Lee, Ph.D. Microchip Technology Inc. 14-pin TSSOP, SOIC, PDIP INTRODUCTION V V 1 14SS SS The MCP2030 is a stand-alone, Analog Front-End CS LCCOM (AFE) device for Low-Frequency (LF) sensing and 2 13 bidirectional communication applications. The device SCLK/ALERT 3 NC12 can output demodulated data, carrier clock or RSSI 030 RSSI LCXcurrent. The demodulated data and carrier clock outputs 4 11 P2 Care available on the LFDATA pin, while the RSSI output LCYNC 105 M is available on the RSSI pin. The RSSI current output is LFDATA/ linearly proportional to the input signal strength. Device LCZ 96 CCLK/SDIO features are controlled by the programming of its internal V V 87DD DD Configuration registers. The device has programmable internal tuning capacitors for each input channel. The user can program these capacitors up to 63 pF, 1 pF per step. These internal TABLE 1: PINOUT DESCRIPTION tuning capacitors can be used effectively for fine-tuning Names Description of the external LC resonant circuit. Supply Voltage: 1.8 - 3.6V.V DD External LC resonant antenna circuits are connected to Chip select input for the modified CS LCX, LCY and LCZ. The LCCOM pin is used as a 3-wire SPI interface.reference terminal for each antenna connection. SCLK Clock input for the modified 3-wire SPI The device can detect an input signal with amplitude as interface. PP and can demodulate an amplitude-low as ~1 mV modulated input signal with as low as an 8% Alert output. This pin goes low if there ALERT modulation depth. An individual channel's sensitivity is a parity error in the Configuration can be reduced by programming the Configuration register, or if the 32 ms alarm timer has register if it is too sensitive. timed out. The device is optimized for very low-current RSSI RSSI current output. consumption and has various battery-saving low- NC Not connected. power modes (Sleep, Standby, Active). The device can LFDATA Demodulated data output. also be operated in Battery Backup and Batteryless CCLK Carrier clock output. modes using a few external components. SDIO Serial input or output data for the The device is available in 14-pin TSSOP, SOIC and modified 3-wire SPI interface. PDIP packages. This device is also used as the AFE in the PIC16F639. Figure 1 shows the pin diagram of the LCX, LCY, Input pins for external LC antennas. device, followed by the pinout descriptions in Table 1. LCZ The key features of the device are summarized in LCCOM Common reference input for the Table 2. external LC antennas. Ground reference voltage.V SS © 2005 Microchip Technology Inc. DS91090B-page 1